CVE-2026-50131

{
  "id": "CVE-2026-50131",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-50131",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-06-11T14:15:27.570315Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.6,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 4.7,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "fedify-dev",
          "product": "fedify",
          "versions": [
            {
              "status": "affected",
              "version": ">= 0.11.2, < 1.9.12"
            },
            {
              "status": "affected",
              "version": ">= 1.10.0, < 1.10.11"
            },
            {
              "status": "affected",
              "version": ">= 2.0.0, < 2.0.19"
            },
            {
              "status": "affected",
              "version": ">= 2.1.0, < 2.1.15"
            },
            {
              "status": "affected",
              "version": ">= 2.2.0, < 2.2.4"
            }
          ]
        },
        {
          "vendor": "fedify-dev",
          "product": "vocab-runtime",
          "versions": [
            {
              "status": "affected",
              "version": "< 2.0.19"
            },
            {
              "status": "affected",
              "version": ">= 2.1.0, < 2.1.15"
            },
            {
              "status": "affected",
              "version": ">= 2.2.0, < 2.2.4"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-06-10T22:17:01.543",
  "references": [
    {
      "url": "https://github.com/fedify-dev/fedify/security/advisories/GHSA-xw9q-2mv6-9fr8",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/fedify-dev/fedify/security/advisories/GHSA-xw9q-2mv6-9fr8",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        },
        {
          "lang": "en",
          "value": "CWE-1286"
        },
        {
          "lang": "en",
          "value": "CWE-1389"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Fedify previously addressed SSRF/internal network access in GHSA-p9cg-vqcc-grcx by adding public URL validation before runtime document and media fetching. However, the IPv4 validation logic present starting in version 0.11.2 and prior to versions 1.9.12, 1.10.11, 2.0.19, 2.1.15, and 2.2.4 appears incomplete. The `validatePublicUrl()` protection relies on `isValidPublicIPv4Address()` to reject non-public IPv4 destinations. The function blocks common private and local ranges such as `10.0.0.0/8`, `127.0.0.0/8`, `169.254.0.0/16`, `172.16.0.0/12`, and `192.168.0.0/16`, but it still treats several special-use, reserved, multicast, benchmarking, and carrier-grade NAT IPv4 ranges as valid public destinations. Because this validation is used as an SSRF defense before outbound fetches, this appears to be an incomplete mitigation or bypass class for the previous SSRF issue. Versions 1.9.12, 1.10.11, 2.0.19, 2.1.15, and 2.2.4 contain an updated patch."
    },
    {
      "lang": "es",
      "value": "Fedify es una biblioteca TypeScript para construir aplicaciones de servidor federadas impulsadas por ActivityPub. Fedify abordó previamente el acceso SSRF/a la red interna en GHSA-p9cg-vqcc-grcx añadiendo validación de URL pública antes de la obtención de documentos y medios en tiempo de ejecución. Sin embargo, la lógica de validación de IPv4 presente a partir de la versión 0.11.2 y anterior a las versiones 1.9.12, 1.10.11, 2.0.19, 2.1.15 y 2.2.4 parece incompleta. La protección 'validatePublicUrl()' se basa en 'isValidPublicIPv4Address()' para rechazar destinos IPv4 no públicos. La función bloquea rangos privados y locales comunes como '10.0.0.0/8', '127.0.0.0/8', '169.254.0.0/16', '172.16.0.0/12' y '192.168.0.0/16', pero aún trata varios rangos IPv4 de uso especial, reservados, de multidifusión, de evaluación comparativa y de NAT de grado de operador como destinos públicos válidos. Debido a que esta validación se utiliza como defensa SSRF antes de las recuperaciones salientes, esto parece ser una mitigación incompleta o una clase de bypass para el problema SSRF anterior. Las versiones 1.9.12, 1.10.11, 2.0.19, 2.1.15 y 2.2.4 contienen un parche actualizado."
    }
  ],
  "lastModified": "2026-07-21T19:10:00.107",
  "sourceIdentifier": "security-advisories@github.com"
}